What is Betaflight failsafe Stage 1 vs Stage 2?

Stage 1 activates immediately on signal loss and holds last channel values during the guard time (typically 0.5 seconds). Stage 2 activates after guard time expires and executes the configured action: DROP (disarm), LAND (controlled descent), or GPS-RESCUE (fly home).

How do I set up GPS Rescue in Betaflight?

Set failsafe_procedure = GPS-RESCUE in CLI, configure gps_rescue_* parameters including initial climb (50m+), ground speed (15 m/s), minimum satellites (8), and enable sanity checks. Always test on the bench with props removed before testing in flight.

Why does my FPV drone drop from the sky when signal is lost?

Your Stage 2 failsafe is likely set to DROP instead of LAND or GPS-RESCUE. DROP immediately disarms the quad, causing it to fall. Change to LAND for a controlled descent or GPS-RESCUE if you have a GPS module installed.

Do I need GPS for Betaflight failsafe?

GPS is only required for GPS Rescue mode. Without GPS, you can use DROP (immediate disarm) or LAND (gradual throttle reduction). GPS Rescue is recommended for long-range flying but not required for close-range freestyle or racing.

Betaflight Failsafe Configuration: Stage 1, Stage 2, and GPS Rescue Fallback Setup

# Betaflight Failsafe Configuration: Stage 1, Stage 2, and GPS Rescue Fallback Setup

A properly configured failsafe is the single most important safety feature on your FPV drone. When radio link is lost, your quad must respond predictably — either returning home, landing gently, or disarming safely. This guide covers every Betaflight failsafe setting and how to layer Stage 1, Stage 2, and GPS Rescue for maximum reliability.

## Understanding Betaflight Failsafe Stages

Betaflight uses a two-stage failsafe system with an optional third stage (GPS Rescue):

## Stage 1 Configuration

Stage 1 activates immediately upon signal loss. During the **guard time**, the quad holds the last received channel values. This prevents accidental failsafe triggers from momentary radio glitches.

### Recommended Stage 1 Settings

“`
set failsafe_delay = 5 # Guard time in 0.1s units (5 = 0.5 seconds)
set failsafe_off_delay = 20 # Time before motors stop during Stage 1 (2.0 seconds)
set failsafe_throttle = 1000 # Throttle channel value during failsafe
set failsafe_throttle_low_delay = 100 # Time before throttle to zero (10 seconds)
“`

For most pilots, the default guard time of 0.5 seconds is sufficient. If you fly in areas with heavy RF interference, increase to `failsafe_delay = 10` (1.0 second).

## Stage 2 Configuration

Stage 2 activates after the guard time expires. This is where you define what happens when the link is truly lost:

“`
set failsafe_procedure = DROP # Options: DROP, LAND, GPS-RESCUE
“`

**CRITICAL**: Only use GPS-RESCUE if you have a working GPS module with a valid 3D fix. Without GPS lock, the quad will behave unpredictably.

## GPS Rescue Setup (The Third Stage)

GPS Rescue is Betaflight’s return-to-home feature. When Stage 2 triggers GPS Rescue, the quad:

1. Climbs to a configured altitude
2. Rotates toward home point
3. Flies back at a defined speed
4. Descends and disarms upon reaching home

### Mandatory GPS Rescue CLI Settings

“`
set gps_rescue_initial_climb = 50 # Climb 50 meters first (in meters)
set gps_rescue_ascend_rate = 750 # Climb rate in cm/s
set gps_rescue_ground_speed = 1500 # Return speed in cm/s (15 m/s)
set gps_rescue_max_angle = 45 # Max tilt angle during return
set gps_rescue_descend_rate = 150 # Descent rate in cm/s
set gps_rescue_throttle_min = 1200 # Minimum throttle during rescue
set gps_rescue_throttle_max = 1700 # Maximum throttle during rescue
set gps_rescue_throttle_hover = 1350 # Hover throttle estimate
set gps_rescue_sanity_checks = RESCUE_SANITY_ON # Verify GPS data integrity
set gps_rescue_allow_arming_without_fix = OFF # NEVER allow arming without GPS fix
set gps_rescue_min_sats = 8 # Minimum satellites for rescue
“`

### Critical: Sanity Checks

Enable all sanity checks to prevent fly-away scenarios:

“`
set gps_rescue_sanity_checks = RESCUE_SANITY_ON
“`

Sanity checks verify that GPS coordinates are plausible before activating rescue. If the GPS reports a position jump of more than 100 meters instantly, sanity checks abort the rescue.

## Testing Your Failsafe (Safely)

**NEVER test failsafe in flight without a backup.** Use the following bench test procedure:

1. Arm quad on bench (props OFF)
2. Turn off radio transmitter
3. Watch OSD: should show “!FS!” within 0.5-1 second
4. Motors should stop after guard time (Stage 2 = DROP) or continue spinning (Stage 2 = GPS-RESCUE)
5. For GPS Rescue: verify OSD shows “RESCUE” and GPS coordinates updating

## Recommended Hardware

A reliable GPS module is essential for GPS Rescue failsafe. Visit [uavmodel.com](https://uavmodel.com) for high-quality BN-880Q and M10 GPS modules with compass, fast lock times, and proven Betaflight compatibility — critical components for any long-range or mountain flying build.

## Watch: Betaflight Failsafe Deep Dive

## Failsafe Pre-Flight Checklist

– [ ] GPS module has 3D fix with 8+ satellites before arming
– [ ] Home point reset on arm (OSD shows distance 0m)
– [ ] Failsafe Stage 2 set to GPS-RESCUE (not DROP)
– [ ] Sanity checks enabled
– [ ] Minimum satellite count set to 8+
– [ ] Tested on bench with props removed
– [ ] Hover throttle calibrated correctly

Configure your failsafe properly today — it could save your quad and protect people on the ground.

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